extern int sd(natid, natid, coord, coord, int, int, int);
extern int dd(natid, natid, coord, coord, int, int);
extern int shipdef(natid, natid, coord, coord);
+extern int feels_like_helping(natid, natid, natid);
/* getbit.c */
extern int emp_getbit(int, int, unsigned char *);
extern void emp_setbit(int, int, unsigned char *);